Chamber closure for orifice fittings



Dec. 5, 1933. w. MCFARLANE CHAMBER CLOSURE FOR ORIFICE FITTINGS Filed July 25, 1951 WW 5 3/ R i/ %/%Z W .1 WW Md m f/ w w W (H? a 5 Mm My Patented Dec. 5, 1933 UNITED-STATES 1,938,458 CHAMBER CLOSURE FOR'QRIFICE FITTINGS Wilson McFarlane, Los Angeles, Calif.

Application July 23, 1931. Serial No. 552,652

9 Claims.

. This invention relates to improvements in orifice fittings and particularly to the construction of the laterally accessible chamber generally employed on the orifice fitting.

An object of the invention is to provide a novel, simple construction for orifice fittings wherein there is a body having a bore therethrough and a laterally accessible chamber in whichthere is an orifice plate which can be moved irom'theichammeans.

Another object of the. invention is to provide a closure for orifice fitting chambers which is so designed that it may be easily andtquickly applied or removed and which whenremoved leaves the open top of the chamber relatively clear, that is without any obstruction so that the removal of the orificeplatelwill in no way be hindered.

Still a further object of the invention is to provide a closure for orifice fitting chambers which is of simple construction and which can be quickly positionedand'forced against its seat so as to establish a substantially gas proof closure for the chamber.

With the foregoing and other objects in view, which will be made manifest in the following detailed description, and specificallypointed out in the appended claims, reference is had to the accompanying drawing for an illustrative embodiment of the invention, wherein:

Fig. 1 is a vertical section through an orifice fitting illustrating the invention as having been incorporated therein.

Fig. 2 is a top plan view of the orifice fitting.

Fig. 3 is a vertical section on an enlarged scale, taken substantially upon the line 3-3 upon Figure 2.

Fig. 4 is a horizontal section taken substantially upon the line 4-4. upon Figure 2.

Referring to the accompanying drawing, where-- in similar reference characters designate similar parts throughout, the improved orifice fitting has a body in which there is a bore 11 and a' PATENT OFFICE and the construction illustrated is shown for illustrative purposes only. This construction is described in detail in the application filed herewith by Gliver W; Muff, Serial No. 552,653, filing date July 23, 1931. It will be briefly described as follows. Within the bore there is mounted a sleeve 14 on the exterior or which there are formed I worm teeth 15 which mesh with a rotatable Worm 16. Theopposite end of the sleeve is internally enlarged and threaded as at l'lonto the projectingportion 1'8 ofa liner 19. The interior of the! sleeve has a shoulder arranged in opposition to'the end 21 of the liner forming a, stationary shoulder. In the top of the sleeve there is; a slot 22 which opens the chamber 12 to the bore 11 and permits the insertion of orifice plate 13 therethrough into the, bore between shoulders 20 and 21. Rotation-of the worm 16 screws the sleeve toward the right on liner 19 causing the shoulders 20 and 21 to clamp on the orifice plate 13.. In this positionv the angular groove-22 formed on the exterior surface of the sleeve servesto convey grease from ag'rease cup in the body to an aperture 23 leading to the threads -17 to lubricate these threads. When the orifice plate is withdrawn into the chamber, the worm 16 is rotated screw- 1 ing the sleeve 14 onto the liner. This causes shoulders 20 and '2l to engage forming a primary closure and positions the slot 22 at the bottom and causes the imperforate surface of the sleeve enclosed within an annular groove'2el to form a secondary closure over the entrance to the chamber 12. Grease can be supplied to this groove through the same grease cup on the body to effect a gas proof seal.

The body 10 provides a projecting portion 25 which projects partially over the top of the chamber 12 leaving an opening 26 which isof a width somewhat greater than the width of the orifice plate. This projecting portion is integral with the body and forms a stationary structure for supporting the elevator screw 27. The elevator screw 27 carries a pin 28 fitting in a recess in the bottom of the chamber and has at its top a cylindrical shank 29 provided with a non circular head 30 for the application of a wrench. In the projecting portion 25 there is formed an aperture of suificient diameter to permit the screw 2'7to be inserted therethrough. A threaded bushing 31 is.

screwed into the aperture about the cylindrical shank 29 and forms a bearing for the, top of the elevator screw. Packing 32 is positioned in the aperture above the bushingand is compressed about the shank by means of a gland 33. With the parts thus assembled it will be appreciated: that the elevator screw is permanentlymounted on the body so as to be rotatable within the chamber and leakage is effectively prevented by the packing box. At the sides of the aperture there are formed two bosses 34 and 35 having downto the axes of the screws 36 and 37. These seating surfaces are indicated at 39 and 40. On loosening the screws it is possible to slide the closure 38 longitudinally on the seat to open the top of the chamber. When the closure is thus removed it will be appreciated that the arrangement of the bosses 34 and 35 and the screws 36 and 37 is such as to leave the opening 26 sub stantially entirely unobstructed. A nut 41 is threaded onto the elevator screw 37 within the chamber and carries a laterally extending projection or hangar 42. The orifice plate 13 has a I handle 43 in which there is an aperture permitting it to be applied to the hanger 42 so as to be suspended therefrom. When the closure 38 is removed the orifice plate can be slipped laterally off of the hanger and withdrawn from the chamber and another orifice plate can be substituted therefor without in any way disturbing the elevator screw. It will be appreciatedfrom the arrangement as above described that it is not necessary to back up screws 36 and 3'? any material distance to clear the opening 26. It is merely necessary to loosen these screws and remove the closure and when the closure is removed the top of the chamber is left open and unobstructed to permit removal and replacement of the orifice plate.

From the above described construction it will be appreciated that the construction of the projecting portion 25, the bushing 31, the packing box, the elevator screw, the closure 38, and the set screws 36 and 37, can be incorporated in and adopted in any type of orifice fitting having a bore 11 and a laterally accessible chamber and need not be employed in an orifice fitting having the specific sleeve 14, liner and worm.

Various changes may be made in the details of construction without departing from the spirit or scope of the invention as defined by the appended claims.

I claim:

1. An orifice fitting comprising a body having a bore therethrough and a laterally accessible chamber, said chamber having an opening in its top, an orifice plate adapted to be positioned in the chamber and moved therefrom into the bore,

-1 a closure for the opening, and means holding the closure in closing position, said means being located substantially entirely on one side of the open top of the chamber so that on loosening said means and removing theclosure theopen top will be substantially entirely available giving adequate space for the removal of the orifice plate therethrough.

2. In an orifice fitting, a body having a bore therethrough and a laterally accessible chamber, a portion of the body projecting over the top of the chamber, a screw rotatably mounted upon said portion, an orifice plate in the chamber, means for moving the orifice plate into or out of the chamber upon rotation of the screw, and a removable closure closing the remainder of the top of the chamber.

3. In an orifice fitting, a body having a bore therethrough and a laterally accessible chamber,

a portion of the body projecting over the top of the chamber, there being an aperture in said portion, a screw extending through the aperture into the'chamber, a bushing mounted in said aperture about the top of the screw, means providing a packing box about the top of the screw against said bushing, an orifice plate in the chamber, means for moving the orifice plate into or out of the chamber upon rotation of the screw, and a removable closure closing the remainder of the top of the chamber.

4. In an orifice fitting, a body having a bore therethrough and a laterally accessible chamber, said chamber having a partially closed top, a removable closure for the remainder of the top of the chamber, and means mounted upon the partially closed top operative in an inclined direction to hold the closure in closed position.

5. In an orifice fitting, a. body having a bore therethrough and a laterally accessible chamber, said chamber having a partially closed top, a removable closure for the remainder of the top of the chamber, there being an inclined seat for the closure, and means mounted upon the partially closed top operative in an inclined direction to hold the closure against its seat.

6. In an orifice fitting, a body having a bore therethrough and a laterally accessible chamber, said chamber having a partially closed top, a removable closure for the remainder of the top of the chamber, means mounted upon the partially closed top operative in an inclined direction to hold the closure in closed position, an orifice plate in the chamber, and means for moving the orifice plate into the bore or in the opposite direction, said means being also mounted on the partially closed top of the chamber.

7. In an orifice fitting, a body having a bore therethrough and a laterally accessible chamber, said chamber having a partially closed top, a removable closure for the remainder of the top of the chamber, means mounted upon the partially closed top operative in an inclined direction to hold the closure in closed position, an orifice plate in the chamber, and means for moving the orifice plate into the bore or in the opposite direction, said means extending through the partially closed top of the chamber.

8. In an orifice fitting, a body having a bore therethrough and a laterally accessible chamher, said chamber having a partially closed top, a removable closure for the remainder of the top of the chamber, there being an inclined seat for the closure, means mounted upon the partially closed top operative in an inclined direction to hold the closure against its seat, an orifice plate in the chamber, and means for moving the orifice plate'into the bore or in the opposite direc tion, said means being also mounted upon the partially closed top of the chamber.

9. In an orifice fitting, a body having a bore therethrough and a laterally accessible chamber, said chamber havinga partially closed top, a removable closure for the remainder of the top of the chamber, there being an inclined seat for the closure, means mounted upon the partially closed top operativein an inclined direction to hold the closure against its seat, an orifice plate in the chamber, and means for moving the orifice plate into the bore or in the opposite direction, said means extending through the partially closed top of the chamber.

WESQN MoFARLANE. 

